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Arduino serial data heatmap plot in python

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0

I am receiving an array of 32 floating numbers from arduino serial monitor into python using pyserial. Further, I want to plot an annotated heatmap with numbers (temperature values) received from arduino serial monitor. I am able to receive the temperature values in python shell and also in the heatmap. But the challenge I am facing is I think the values are not synchronous i.e What I should do to map the cells with specific values.

I am attaching the code below:

import numpy as np
import matplotlib
import matplotlib.pyplot as plt
import serial
import time

tempdata = serial.Serial("COM8",38400,timeout=0.1)
strn = []

rows = ["A","B","C","D"]
columns = ["1", "2", "3", "4",
 "5", "6", "7","8"]

tempsArray = np.empty((1,32))

plt.ion()

fig, ax = plt.subplots()
# The subplot colors do not change after the first time
# if initialized with an empty matrix
im = ax.imshow(np.random.rand(4,8),cmap='plasma')

# Axes ticks
ax.set_xticks(np.arange(len(columns)))
ax.set_yticks(np.arange(len(rows)))
# Axes labels
ax.set_xticklabels(columns)
ax.set_yticklabels(rows)
# Rotate the tick labels and set their alignment.
plt.setp(ax.get_xticklabels(), rotation=45, ha="right",
 rotation_mode="anchor")

ax.set_title("")

fig.tight_layout()

text = []

while True: #Makes a continuous loop to read values from Arduino

 tempdata.flush()
 strn = tempdata.readline()[:] #reads the value from the serial port as a 
string
tempsString = np.asarray(strn)
tempsFloat = np.fromstring(tempsString, dtype=float, sep= ',')

tempsArray.flat=tempsFloat 
print(tempsArray)
im.set_array(tempsArray)

#Delete previous annotations
for ann in text:
 ann.remove()
text = []

#Loop over data dimensions and create text annotations.
for i in range(len(rows)):
 for j in range(len(columns)):
 text.append(ax.text(j, i, tempsArray[i, j],
 ha="center", va="center", color="b"))

# allow some delay to render the image
plt.pause(0.1)

plt.ioff()

python arduino heatmap

share|improve this question

edited Oct 10 '18 at 1:30

Mahendra Gunawardena

1,52651937

asked Oct 8 '18 at 10:45

tshivamtshivam

204

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Yeah i solved it. Will post the github link if anyone needs it.
  
  – tshivam
  Oct 10 '18 at 4:53
  

  
  
  
  

add a comment | 

0

I am receiving an array of 32 floating numbers from arduino serial monitor into python using pyserial. Further, I want to plot an annotated heatmap with numbers (temperature values) received from arduino serial monitor. I am able to receive the temperature values in python shell and also in the heatmap. But the challenge I am facing is I think the values are not synchronous i.e What I should do to map the cells with specific values.

I am attaching the code below:

import numpy as np
import matplotlib
import matplotlib.pyplot as plt
import serial
import time

tempdata = serial.Serial("COM8",38400,timeout=0.1)
strn = []

rows = ["A","B","C","D"]
columns = ["1", "2", "3", "4",
 "5", "6", "7","8"]

tempsArray = np.empty((1,32))

plt.ion()

fig, ax = plt.subplots()
# The subplot colors do not change after the first time
# if initialized with an empty matrix
im = ax.imshow(np.random.rand(4,8),cmap='plasma')

# Axes ticks
ax.set_xticks(np.arange(len(columns)))
ax.set_yticks(np.arange(len(rows)))
# Axes labels
ax.set_xticklabels(columns)
ax.set_yticklabels(rows)
# Rotate the tick labels and set their alignment.
plt.setp(ax.get_xticklabels(), rotation=45, ha="right",
 rotation_mode="anchor")

ax.set_title("")

fig.tight_layout()

text = []

while True: #Makes a continuous loop to read values from Arduino

 tempdata.flush()
 strn = tempdata.readline()[:] #reads the value from the serial port as a 
string
tempsString = np.asarray(strn)
tempsFloat = np.fromstring(tempsString, dtype=float, sep= ',')

tempsArray.flat=tempsFloat 
print(tempsArray)
im.set_array(tempsArray)

#Delete previous annotations
for ann in text:
 ann.remove()
text = []

#Loop over data dimensions and create text annotations.
for i in range(len(rows)):
 for j in range(len(columns)):
 text.append(ax.text(j, i, tempsArray[i, j],
 ha="center", va="center", color="b"))

# allow some delay to render the image
plt.pause(0.1)

plt.ioff()

python arduino heatmap

share|improve this question

edited Oct 10 '18 at 1:30

Mahendra Gunawardena

1,52651937

asked Oct 8 '18 at 10:45

tshivamtshivam

204

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Yeah i solved it. Will post the github link if anyone needs it.
  
  – tshivam
  Oct 10 '18 at 4:53
  

  
  
  
  

add a comment | 

I am receiving an array of 32 floating numbers from arduino serial monitor into python using pyserial. Further, I want to plot an annotated heatmap with numbers (temperature values) received from arduino serial monitor. I am able to receive the temperature values in python shell and also in the heatmap. But the challenge I am facing is I think the values are not synchronous i.e What I should do to map the cells with specific values.

I am attaching the code below:

import numpy as np
import matplotlib
import matplotlib.pyplot as plt
import serial
import time

tempdata = serial.Serial("COM8",38400,timeout=0.1)
strn = []

rows = ["A","B","C","D"]
columns = ["1", "2", "3", "4",
 "5", "6", "7","8"]

tempsArray = np.empty((1,32))

plt.ion()

fig, ax = plt.subplots()
# The subplot colors do not change after the first time
# if initialized with an empty matrix
im = ax.imshow(np.random.rand(4,8),cmap='plasma')

# Axes ticks
ax.set_xticks(np.arange(len(columns)))
ax.set_yticks(np.arange(len(rows)))
# Axes labels
ax.set_xticklabels(columns)
ax.set_yticklabels(rows)
# Rotate the tick labels and set their alignment.
plt.setp(ax.get_xticklabels(), rotation=45, ha="right",
 rotation_mode="anchor")

ax.set_title("")

fig.tight_layout()

text = []

while True: #Makes a continuous loop to read values from Arduino

 tempdata.flush()
 strn = tempdata.readline()[:] #reads the value from the serial port as a 
string
tempsString = np.asarray(strn)
tempsFloat = np.fromstring(tempsString, dtype=float, sep= ',')

tempsArray.flat=tempsFloat 
print(tempsArray)
im.set_array(tempsArray)

#Delete previous annotations
for ann in text:
 ann.remove()
text = []

#Loop over data dimensions and create text annotations.
for i in range(len(rows)):
 for j in range(len(columns)):
 text.append(ax.text(j, i, tempsArray[i, j],
 ha="center", va="center", color="b"))

# allow some delay to render the image
plt.pause(0.1)

plt.ioff()

python arduino heatmap

share|improve this question

edited Oct 10 '18 at 1:30

Mahendra Gunawardena

1,52651937

asked Oct 8 '18 at 10:45

tshivamtshivam

204

import numpy as np
import matplotlib
import matplotlib.pyplot as plt
import serial
import time

tempdata = serial.Serial("COM8",38400,timeout=0.1)
strn = []

rows = ["A","B","C","D"]
columns = ["1", "2", "3", "4",
 "5", "6", "7","8"]

tempsArray = np.empty((1,32))

plt.ion()

fig, ax = plt.subplots()
# The subplot colors do not change after the first time
# if initialized with an empty matrix
im = ax.imshow(np.random.rand(4,8),cmap='plasma')

# Axes ticks
ax.set_xticks(np.arange(len(columns)))
ax.set_yticks(np.arange(len(rows)))
# Axes labels
ax.set_xticklabels(columns)
ax.set_yticklabels(rows)
# Rotate the tick labels and set their alignment.
plt.setp(ax.get_xticklabels(), rotation=45, ha="right",
 rotation_mode="anchor")

ax.set_title("")

fig.tight_layout()

text = []

while True: #Makes a continuous loop to read values from Arduino

 tempdata.flush()
 strn = tempdata.readline()[:] #reads the value from the serial port as a 
string
tempsString = np.asarray(strn)
tempsFloat = np.fromstring(tempsString, dtype=float, sep= ',')

tempsArray.flat=tempsFloat 
print(tempsArray)
im.set_array(tempsArray)

#Delete previous annotations
for ann in text:
 ann.remove()
text = []

#Loop over data dimensions and create text annotations.
for i in range(len(rows)):
 for j in range(len(columns)):
 text.append(ax.text(j, i, tempsArray[i, j],
 ha="center", va="center", color="b"))

# allow some delay to render the image
plt.pause(0.1)

plt.ioff()

share|improve this question

edited Oct 10 '18 at 1:30

Mahendra Gunawardena

1,52651937

asked Oct 8 '18 at 10:45

tshivamtshivam

204

share|improve this question

edited Oct 10 '18 at 1:30

Mahendra Gunawardena

1,52651937

asked Oct 8 '18 at 10:45

tshivamtshivam

204

edited Oct 10 '18 at 1:30

Mahendra Gunawardena

1,52651937

edited Oct 10 '18 at 1:30

Mahendra Gunawardena

1,52651937

asked Oct 8 '18 at 10:45

tshivamtshivam

204

asked Oct 8 '18 at 10:45

tshivamtshivam

204